CODEWITHSUNDEEP
iosswiftrealmcodable
King
King

Reputation: 2025

Using an Object with ream codable

I have an application where I tried using UserDefaults to save a Codable model locally but the problem is that UserDefault does not store all the values of the Model and assigns nil to some of them and at times the proper value is assigned. So I decided to try an alternative which is realm and I am able to modify my model to work with realm but I have an issue not which is in the process of decoding an Object in an Object using realm. I was able to make it work when dealing with an Array object with List but non array Objects simply failed to map to JSON

below is a sample array that I am dealing with

{
    "id": 732,
    "name": "Vendor Name",
    "logo": ".../thumb/missing.png",
    "kitchens":
      {
        "id": 36,
        "name": "Sandwiches"
      }
  }

model class

class VendorsList : Object, Decodable {
    @objc dynamic var id : Int = 0
    @objc dynamic var name : String?
    @objc dynamic var logo : String?
    // Create your Realm List.
    var kitchensList = List<VendorKitchens>()

    override class func primaryKey() -> String? {
        return "id"
    }

    private enum CodingKeys: String, CodingKey {
        case id
        case name
        case logo
        // Set JSON Object Key
        case kitchensList = "kitchens"

    }

    public required convenience init(from decoder: Decoder) throws {
        self.init()
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self.id = try container.decode(Int.self, forKey: .id)
        self.name = try container.decode(String.self, forKey: .name)
        self.logo = try container.decode(String.self, forKey: .logo)
        // Map your JSON Array response
        let kitchens = try container.decodeIfPresent([VendorKitchens].self, forKey: .kitchensList) ?? [VendorKitchens()]
        kitchensList.append(objectsIn: kitchens)

    }

}


class VendorKitchens : Object, Decodable {
    @objc dynamic var id : Int = 0
    @objc dynamic var name : String?

    override class func primaryKey() -> String? {
        return "id"
    }

    private enum CodingKeys: String, CodingKey {
        case id
        case name
    }
}

this returns an error

Failed to map data to JSON

Upvotes: 1

Views: 288

Answers (1)

Sajitron
Sajitron

Reputation: 346

Here, try this.

class VendorsList : Object, Decodable {
    @objc dynamic var id : Int = 0
    @objc dynamic var name : String?
    @objc dynamic var logo : String?
    @objc dynamic var kitchens: VendorKitchens? = nil

    override class func primaryKey() -> String? {
        return "id"
    }

    private enum CodingKeys: String, CodingKey {
        case id
        case name
        case logo
        case kitchens = "kitchens"

    }

    public required convenience init(from decoder: Decoder) throws {
        self.init()
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self.id = try container.decode(Int.self, forKey: .id)
        self.name = try container.decode(String.self, forKey: .name)
        self.logo = try container.decode(String.self, forKey: .logo)
        kitchens = try container.decodeIfPresent(VendorKitchens.self, forKey: .kitchensList)

    }

}


class VendorKitchens : Object, Decodable {
    @objc dynamic var id : Int = 0
    @objc dynamic var name : String?

    override class func primaryKey() -> String? {
        return "id"
    }

    private enum CodingKeys: String, CodingKey {
        case id
        case name
    }
}

Upvotes: 1

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